Watchcase type receiver



June 1 1926.. 1,587,203 D. w. WELLS WATC HCASE TYPE RECEIVER Filed June 25, 1925 Patented June l, 192%.

ll t

DANA Ff/WELLS, OF DANSVILLE, NEW YORK.

EVATGHCASE TYPE RECEIVER.

Application filed'a'une 25, 1925. Serial No. 39,526.

This invention relates to improvements in the construction of watch case type receivers more especially adapted for use in the re caption of radio signals.

An object of this invention resides in providing a watch case type of receiver particularly adapted for use in radio work which is constructed in order to obtain the highest efficiency in operation and therefore greatest sensitivity.

Another object of the inven ion resides in providing a structure which will retain the last mentioned object and which will include the usual metallic case provided with an annular insulating disk in the bottom thereof provided with lateral extensions from the periphery in and against which is seated the pole pieces and substantially ring aped magnets arranged so that the pole pieces which are of angular form project radially in "aid from the adjacent ends of the map;- net and have spaced parallel portions mounted in suitable spool ends upon which is directly wound a pair of wire coils having one end of each coil electrically connected to its respective pole piece while the opposite end of each coil is electrically connected to a suitable securing means which xtends through the permanent magnet and the respective pole pieces and through the case and which is suitably insulated from the pole pieces and the magnet, so that when secured in rigid relation all of the parts will be mounted in assembled relation and the securing means will form a circuit for receiving the terminal connection for inserting the two coils in a suitable radio circuit for operation.

The invention further comprehends improvements in the details of construction and arrangement of parts which are more particularly pointed out in the following detailed description and claims directed to a preferred form of the invention, it being understood however, that various changes in the size, formation, and arrangement of the parts may be made without departing from the spirit or scope of the invention as herein set forth.

In the drawing forming part of this application Figure 1 is a vertical transverse sectional view through the improved receiver construction.

Fig. 2 is a bottom plan view of the magnet and pole pieces with the windings thereon.

Fig. 3 is a plan view of the insulating; disk member.

Fig. 4 is a side elevation of the insulating,- dislr. shown in Fig. 3.

Fig. 5 is an enlarged detail elcvational view of one of the polepieces, showing portions broken away and in section in order to illustrate the details or construction thereof.

1 indicates a metallic case which may be of the usual structure of aluminum or the like which is used in the making of the watch case type of receiver. lVithin the bottom portion of this case 1. is mounted the annular insulating disk 2 which is pro vided with laterally extending projections il in s aaced relation around the periphery thereof. This dish 2 is mounted as shown in Fig. 1 and within which is positioned the substantially ring-shaped permanent magnet 4i having the ends indicated at 5 terminating in spaced relation. P is pieces 6 of angular form have the end portions 7 secured to the ends of the magnet l and positioned on the under side thereof as clearly shown in Figs. 1 and 2. The other ends 8 oi? these polo pieces extentL upwardly within the case in spaced parallel relation at opposite sides of the antenna of the nia 'net 4- and upon which are positioned pairs or spool ends 9 at the top and bottom portions of the ends 8 of the pole pieces respectively. The spool ends at the lower end portions 8 of the pole pieces are held in position by the angn aily ranged end '4 and the projection 10 extending in an opposite direction therefrom. The spool ends at the upper ends of the portions 8 are retained by the outwardly struck portions 11 from the upper edges. Between the spool ends and within a predetermined zone around each pole piece is wound the wire coil 12 of suitable enameled wire directly upon the pole piece in order that a maximum number of convolutions may be wound within said predetermined zone on said pole piece. The end of each coil of wire is electrically connected to the pole piece as indiated at 13 in Fig. 5, so that the pole pieces and magnet form the electric circuit between the coils.

Screws 1% are extended through the ends of the magnet l, the pole pieces 7 are suitably insulated therefrom by the sleeve 15 and then extended through the disk 2 and be case 1 and upon the back of the case receivcs the nut 16 so that the parts may be i-uitably and rigidly mounted in assembler relation within the case. The ends of the coils are connected to the lugs l7 which are secured on top of the insulating washers18 and lit under the head of the screws 14c to provide convenient means for connecting the coils 12 in circuit.

"the direct n'lounting of the coils 12 on the pole pieces 8 provides for the reception of a greaternumber of turns oi wire within a predetermined Zone on said pole pieces so that greater eiliciency can be obtained as a result of this construction over the usual present construction of receivers in which the pole pieces are provided with an insulating covering of suitable form before the wire is wound thereon. In addition, the electrical connection of the ends of the coils 12 as indicated at 13 to the pole pieces, utilizes the pole pieces and the n'iagnet for forming the circuit connection between the coils 12 which also forms a magnetic circuit ol the receiver. The provision in the insulating disk 2 between the magnet and the pole pieces and the case for insulating the magnet spool pieces from the case an additional feature of the present construction as it entirely eliminates any electrical connection of the circuit with the coils 12 or with the case which is now present in the ordinary type of receiver used through the direct contact of the magnet and pole pieces with the metallic case.

In watch case receivers of the ordinary type as now used as above set :lorth, should the insulation become destroyed on one of the wires the same contacts with the pole piece on the magnet, the circuit made with the case and the elliciency of the operation of the receiver lessened by reason of the leakage in the current to the case. In the present construction the insulating sleeve 15 and the insulating washers 19 prevent electrical connection of the screws 14 with the case so that no electrical connection is in any way made with the receiver case.

This construction has been found to be highly ellicient in operation and exceedingly sensitive due to the advantages obtained as above described.

ll hat is claimed is A watch case type radio receiver, comprising a metallic case, a substantially ringshaped magnet having the ends terminating in preijletermined space relation, said magnet litting within said case, a pair of pole pieces of angular :l orm having one end of each secured to the end portion of the magnet and extending radially inward, the opposite ends being arranged in spaced parallel. relation in the central portion of the magnet, spool end disks mounted on the pole pieces at opposite ends of the parallel portions, said pole pieces being formed with struck out portions for retaining the end disk in position, a maximum number of wire coil convolutions mounted directly on sch pole piece between the end disks and within a predetermined zone around said pole pieces, one end of each wire being electrically connected with the pole piece, an annular disk of insulating material forming with lateral projecting portions at spaced intervals on the periphery mounted in the bottom of the metallic case and insulating the pole pieces and magnet from the case, and assembling means insulated from the case extending through the ends of the magnet, the pole pieces, insulating disk and the case for rigidly mounting the several parts together, said means being insulatcd from the magnet and pole pieces, the ends or the coils being electrically connected thereto and the pole pieces and magnet providing both. the magnetic circuit and the electrical circuit between the wire coils on each pole piece.

In testin'iony whereof I allix my signature.

DANA W. WELLS. 

